support proxies with docker on rhel

roles/docker/tasks/main.yml

@@ -53,6 +53,11 @@
   with_items: "{{ docker_package_info.pkgs }}"
   when: docker_package_info.pkgs|length > 0
 
+- name: allow for proxies on RHEL systems
+  include: rhel-proxies.yml
+  when: ansible_distribution in ["CentOS","RedHat"] and
+        ansible_distribution_major_version >= 7
+
 - meta: flush_handlers
 
 - name: ensure docker service is started and enabled